* Replace all uses of StrPath, BytesPath, and AnyPath in Python 2 stubs.
* Add StrOrBytesPath as preferred alias for AnyPath.
* Replace all remaining AnyPath instances with StrOrBytesPath.
* Mark AnyPath as obsolete.
Part of #5470
* run script and do some manual changes (Akuli)
* do the whole thing manually (srittau)
* merge changes (Akuli)
Co-authored-by: Sebastian Rittau <srittau@rittau.biz>